<template>
  <div>
    <span v-for="(item,index) in arr" :key="index"><input type="checkbox" v-model="newArr" :value="item">{{item}}</span>
    <p>你选中的元素，累加的值和为：{{sunFn}}</p>
  </div>

</template>

<script>
export default {
  data(){
    return{
    arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
    newArr:[]
    }
  },
  computed:{
    sunFn(){
      return this.newArr.reduce((sum,cur)=>sum+=cur,0)
    }
  }
}
</script>

<style>
  span{
    padding: 5px 10px;
  }
</style>